Patrick Patterson, the Oklahoma City Thunder’s projected starting power forward for the upcoming season, and one of the team’s biggest free agent signings this offseason underwent arthroscopic surgery on his left knee Thursday morning.

The team announced that the former Toronto Raptors forward will be re-evaluated in 4-6 weeks which could potentially put him in question for training camp which begins on September 26, but ESPN’s Royce Young tweeted that Patterson is likely going to be ready to join the team by then.

Thanks for all the get well soon wishes and prayers.. I’ll be back soon better than ever. #ThunderUp

Patterson has reportedly dealt with discomfort in his knee since 2013, and missed 17 games last season due to the injury. If all heals correctly, Patterson should be on track to suit up for the Thunder’s season opener on October 19 against the New York Knicks.

The Thunder signed Patterson to a three-year, $16.4 million contract in July.

The eight-year veteran averaged 6.8 points and 4.5 rebounds for the Raptors in a reserve role. He has also spent time with the Houston Rockets and the Sacramento Kings.